MASON, OH - AUGUST 18: Roger Federer of Switzerland plays Stanislas Wawrinka of Switzerland during the semifinals of the Western & Southern Open at the Lindner Family Tennis Center on August 18, 2012 in Mason, Ohio. (Photo by Matthew Stockman/Getty Images)
MASON, OH - AUGUST 18: Roger Federer of Switzerland plays Stanislas Wawrinka of Switzerland during the semifinals of the Western & Southern Open at the Lindner Family Tennis Center on August 18, 2012 in Mason, Ohio. (Photo by Matthew Stockman/Getty Images)
